#!/usr/bin/env bash
# shellcheck disable=SC2230
#  vim:ts=4:sts=4:sw=4:et
#
#  Author: Hari Sekhon
#  Date: 2019-02-15 21:31:10 +0000 (Fri, 15 Feb 2019)
#
#  https://github.com/harisekhon/bash-tools
#
#  License: see accompanying Hari Sekhon LICENSE file
#
#  If you're using my code you're welcome to connect with me on LinkedIn and optionally send me feedback to help steer this or other code I publish
#
#  https://www.linkedin.com/in/harisekhon
#

# Install RPM packages in a forgiving way - useful for installing Perl CPAN and Python PyPI modules that may or may not be available
#
# combine with later use of the following scripts to only build packages that aren't available in the Linux distribution:
#
# perl_cpanm_install_if_absent.sh
# python_pip_install_if_absent.sh

set -eu
[ -n "${DEBUG:-}" ] && set -x

usage(){
    echo "Installs Yum RPM packages"
    echo
    echo "Takes a list of yum packages as arguments or .txt files containing lists of modules (one per line)"
    echo
    echo "usage: ${0##*} <list_of_packages>"
    echo
    exit 3
}

for arg; do
    case "$arg" in
        -*) usage
            ;;
    esac
done

packages=""

process_args(){
    for arg; do
        if [ -f "$arg" ]; then
            echo "adding packages from file:  $arg"
            packages="$packages $(sed 's/#.*//;/^[[:space:]]*$$/d' "$arg")"
            echo
        else
            packages="$packages $arg"
        fi
        # uniq
    done
}

if [ -n "${*:-}" ]; then
    process_args "$@"
else
    # shellcheck disable=SC2046
    process_args $(cat)
fi

echo "Installing RPM Packages"

if [ -z "${packages// }" ]; then
    exit 0
fi

packages="$(echo "$packages" | tr ' ' ' \n' | sort -u | sed '/^[[:space:]]*$/d')"

# RHEL8 ruining things with no default python and lots of python package renames
# - handling systematically rather than exploding out all my repos package lists
if [ -n "${NO_FAIL:-}" ]; then
    if grep -q '^REDHAT_SUPPORT_PRODUCT_VERSION="8"' /etc/*release 2>/dev/null; then
        if grep -q 'python-' <<< "$packages"; then
            # shellcheck disable=SC2001
            packages="$packages
$(sed 's/^python-/python2-/' <<< "$packages")
$(sed 's/^python-/python3-/' <<< "$packages")
$(sed '/^python[23]*-/d; s/^/python2-/' <<< "$packages")
$(sed '/^python[23]*-/d; s/^/python3-/' <<< "$packages")"
            echo "Expanding Python packages out to: $packages"
        fi
    fi
fi

SUDO=""
# shellcheck disable=SC2039
[ "${EUID:-$(id -u)}" != 0 ] && SUDO=sudo

if [ -n "${NO_FAIL:-}" ]; then
    if type -P dnf &>/dev/null; then
        # dnf exits if any of the packages aren't found so do them individually and ignore failures
        for package in $packages; do
            rpm -q "$package" || $SUDO dnf install -y "$package" || :
        done
    else
        # shellcheck disable=SC2086
        $SUDO yum install -y $packages || :
    fi
else
    # dnf exists with a proper error code on any error so faster to do all packages together
    if type -P dnf &>/dev/null; then
        # want splitting
        # shellcheck disable=SC2086
        dnf install -y $packages
    else
        # must install separately to check install succeeded because yum install returns 0 when some packages installed and others didn't
        for package in $packages; do
            rpm -q "$package" || $SUDO yum install -y "$package"
        done
    fi
fi
